Storage system and failover control method

Abstract

A storage system is capable of configuring a failover system by use of a first storage processing device to which first storage media are connected and a second storage processing device to which second storage media are connected. The storage system sets the RAID level of the second storage media to a RAID level with lower redundancy than the RAID level of the first storage media, if the storage capacity of the second storage media is smaller than the storage capacity of the first storage media.

What is claimed is: 
     
       1. A storage system capable of configuring a failover system by use of a first storage processing device to which first storage media are connected and a second storage processing device to which second storage media are connected, the storage system including:
 a communication interface configured to receive storage capacity information representing a storage capacity of the second storage media; and 
 circuitry configured to:
 compare the storage capacity of the second storage media to a storage capacity of the first storage media; 
 set a RAID level of the second storage media to a RAID level with lower redundancy than the RAID level of the first storage media, if the storage capacity of the second storage media is smaller than the storage capacity of the first storage media; and 
 stop application of RAID scheme to the second storage media and store user data stored in the first storage media into the second storage media when the failover system cannot be configured by use of the second storage media having the RAID level with lower redundancy than the RAID level of the first storage media. 
 
 
     
     
       2. The storage system according to  claim 1 , further including:
 an interface configured to output a notification that the RAID level of the second storage media is a RAID level with the lower redundancy than the RAID level of the first storage media. 
 
     
     
       3. The storage system according to  claim 1 , further including:
 an interface configured to output a notification that the free space in the second storage media is smaller than a predetermined value. 
 
     
     
       4. A failover control method used in a storage system capable of configuring a failover system by use of a first storage processing device to which first storage media are connected and a second storage processing device to which second storage media are connected, the failover control method including:
 acquiring storage capacity information representing a storage capacity of the second storage media; 
 comparing the storage capacity of the second storage media to a storage capacity of the first storage media; and 
 setting the RAID level of the second storage media to a RAID level with lower redundancy than the RAID level of the first storage media, if the storage capacity of the second storage media is smaller than the storage capacity of the first storage media; and 
 stopping application of RAID scheme to the second storage media and storing user data stored in the first storage media into the second storage media when the failover system cannot be configured by use of the second storage media having the RAID level with lower redundancy than the RAID level of the first storage media.